Biology Multiple Choice Questions and Answers for Different Competitive Exams

Biology Practice Test on Ecology and Environment - Biodiversity

The term biodiversity refers to the totality of genes, species and ecosystems of a region. One of the world’s most pressing crisis today is the biodiversity loss. This is because the biologically rich and unique habitats are being destroyed, fragmented and degraded by increasing human population, resource consumption and pollution.


Biology Practice Test on Biodiversity
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1. Beta diversity is diversity
On a plain
In a community
Between communities
In mountain gradient

2. What is Keystone species?
a rare species that has minimal impact on the biomass and on other species in the community
a dominant species that constitutes a large proportion of the biomass and which affects many other species
a common species that has minimal impact on the biomass and on other species in the community
a species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community’s organization and survival

3. Habitat loss and fragmentation, over exploitation, alien species invasion and co extinction are causes for
Biodiversity loss
Ecological succession

4. The venue and year of the Earth Summit on Conservation of Biodiversity was
South Africa, 2002
Johnnesberg, 2004
Rio de Jeneiro, 1992
Stockholm, 1974

5. Which of the following is commonly found in temperate coniferous forest?
Shorea robusta
Pinus wallichiana

6. Plant species having a wide range of genetical distribution evolve into a local population known as

7. The percentage of forest cover recommended by the National Forest Policy (1988)
37 % for plains and 63% for hills
33 % for plains and 67% for hills
23 % for plains and 77% for hills
35 % for plains and 65% for hills

8. Barnacles growing on the back of whale is an example of

9. The species of plants that play a vital role in controlling the relative abundance of other species in a community are called
Edge species
Link species
Pioneer species
Keystone species

10. The diversity of the habitats over the total geographical area is called
Alpha diversity
Gamma diveristy
Beta diversity
Delta diversity

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